What Is Earnings Per Share (EPS)?
Earnings per share expresses a company's profit on a per-share basis so investors can relate earnings directly to the stock they own. The basic formula is EPS = (Net Income - Preferred Dividends) / Weighted Average Shares Outstanding.
EPS matters because total net income alone says nothing about your slice of it. A company can grow profits while diluting shareholders with new stock, leaving EPS, and each investor's claim, flat or lower.
Basic vs. Diluted EPS
Basic EPS uses only shares currently outstanding, while diluted EPS assumes all in-the-money stock options, warrants, RSUs, and convertible securities are converted into common shares. Diluted EPS is always equal to or lower than basic EPS and is the more conservative figure analysts prefer.
The gap between the two can be significant at companies that pay heavily in stock, which is why diluted share counts are standard in valuation models.
Example
A company earns $500 million of net income with 200 million weighted average shares outstanding, so basic EPS is $2.50. If options and RSUs add 20 million potential shares, diluted EPS is $500 million / 220 million = $2.27. At a stock price of $45.40, the diluted P/E ratio is 20x.
Why It Matters
Quarterly results are judged largely on whether EPS beats or misses consensus estimates, and stocks often move sharply on the answer. Share buybacks raise EPS by shrinking the denominator, which is one reason companies repurchase stock.
In M&A, bankers test whether a deal is accretive or dilutive by asking whether the acquirer's pro forma EPS goes up or down, a staple of investment banking interview questions.
